/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.dx.cf.attrib;

import com.android.dx.rop.type.TypeList;
import com.android.dx.util.MutabilityException;

/**
 * Attribute class for standard {@code Exceptions} attributes.
 */
public final class AttExceptions extends BaseAttribute {

	/** {@code non-null;} attribute name for attributes of this type */
	public static final String ATTRIBUTE_NAME = "Exceptions";

	/** {@code non-null;} list of exception classes */
	private final TypeList exceptions;

	/**
	 * Constructs an instance.
	 * 
	 * @param exceptions
	 *            {@code non-null;} list of classes, presumed but not verified
	 *            to be subclasses of {@code Throwable}
	 */
	public AttExceptions(TypeList exceptions) {
		super(ATTRIBUTE_NAME);

		try {
			if (exceptions.isMutable()) {
				throw new MutabilityException("exceptions.isMutable()");
			}
		} catch (NullPointerException ex) {
			// Translate the exception.
			throw new NullPointerException("exceptions == null");
		}

		this.exceptions = exceptions;
	}

	/** {@inheritDoc} */
	public int byteLength() {
		return 8 + exceptions.size() * 2;
	}

	/**
	 * Gets the list of classes associated with this instance. In general, these
	 * classes are not pre-verified to be subclasses of {@code Throwable}.
	 * 
	 * @return {@code non-null;} the list of classes
	 */
	public TypeList getExceptions() {
		return exceptions;
	}
}
